Alcatel-Lucent
7450 ETHERNET SERVICE SWITCH
7750 SERVICE ROUTER
7950 EXTENSIBLE ROUTING SYSTEM
QUALITY OF SERVICE GUIDE
RELEASE 14.0.R1
QUALITY OF SERVICE GUIDE RELEASE 14.0.R1
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Copyright 2016 Alcatel-Lucent.
All rights reserved.
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Quality of Service Guide 3
Table of Contents
Getting Started...................................................................................................................................... 15
About This Guide................................................................................................................................................15
Alcatel-Lucent SR-Series Router Services Configuration Process ....................................................................15
QoS Policies ......................................................................................................................................... 17
In This Chapter ...................................................................................................................................................17
QoS Overview ....................................................................................................................................................17
Forwarding Classes.......................................................................................................................................18
High Priority Classes................................................................................................................................19
Assured Classes ......................................................................................................................................20
Best-Effort Classes ..................................................................................................................................20
Queue Parameters .............................................................................................................................................21
Queue ID ......................................................................................................................................................21
Unicast or Multipoint Queue ..........................................................................................................................21
Queue Hardware Scheduler..........................................................................................................................22
Committed Information Rate ........................................................................................................................22
Peak Information Rate...................................................................................................................................23
Adaptation Rule.............................................................................................................................................24
Committed Burst Size ...................................................................................................................................25
Maximum Burst Size .....................................................................................................................................26
High Priority Only Buffers ..............................................................................................................................26
Hi-Low Priority Only Buffers ..........................................................................................................................27
WRED Per Queue .........................................................................................................................................27
Native Queue Mode .................................................................................................................................28
Pool per Queue Mode ..............................................................................................................................31
Packet Markings............................................................................................................................................34
Queue Counters ............................................................................................................................................35
Queue-Types.................................................................................................................................................36
Color Aware Profiling.....................................................................................................................................36
QoS Policies .......................................................................................................................................................37
Service versus Network QoS ........................................................................................................................40
QoS Policy Entities........................................................................................................................................41
Network QoS Policies....................................................................................................................................42
Network Queue QoS Policies ........................................................................................................................44
Service Ingress QoS Policies ........................................................................................................................47
FC Mapping Based on EXP Bits at VLL/VPLS SAP ................................................................................50
Egress Forwarding Class Override ..........................................................................................................53
Service Egress QoS Policies.........................................................................................................................54
Named Pool Policies .....................................................................................................................................56
Slope Policies................................................................................................................................................58
RED Slopes..............................................................................................................................................59
Tuning the Shared Buffer Utilization Calculation......................................................................................62
Slope Policy Parameters..........................................................................................................................64
Scheduler Policies.........................................................................................................................................65
Virtual Hierarchical Scheduling ................................................................................................................67
Tiers .........................................................................................................................................................68
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4 Quality of Service Guide
Scheduler Policies Applied to Applications ..............................................................................................71
Scheduler Policies Applied to SAPs.........................................................................................................73
Customer Service Level Agreement (SLA) ..............................................................................................74
Scheduler Policies Applied to Multi-Service Sites ...................................................................................74
Shared Queues .............................................................................................................................................74
ATM Traffic Descriptor Profiles .....................................................................................................................75
Configuration Notes.......................................................................................................................................75
Network QoS Policies .......................................................................................................................... 77
In This Section....................................................................................................................................................77
Overview.............................................................................................................................................................77
Network Ingress Tunnel QoS Override .........................................................................................................78
For Tunnel Terminated IP Routing Decisions ..........................................................................................78
QoS for Self-Generated (CPU) Traffic on Network Interfaces..................................................................81
Basic Configurations...........................................................................................................................................84
Create a Network QoS Policy........................................................................................................................84
Applying Network Policies .............................................................................................................................86
Default Network Policy Values ......................................................................................................................87
Service Management Tasks ...............................................................................................................................91
Deleting QoS Policies....................................................................................................................................91
Remove a Policy from the QoS Configuration...............................................................................................92
Copying and Overwriting Network Policies ...................................................................................................93
Editing QoS Policies......................................................................................................................................94
Network QoS Policy Command Reference ........................................................................................................95
Command Hierarchies...................................................................................................................................95
Configuration Commands ........................................................................................................................95
Self-Generated Traffic Commands ..........................................................................................................97
Operational Commands ...........................................................................................................................98
Show Commands.....................................................................................................................................98
Command Descriptions .................................................................................................................................99
Configuration Commands ........................................................................................................................99
Operational Commands ...........................................................................................................................99
Show Commands...................................................................................................................................133
Network Queue QoS Policies ............................................................................................................ 147
In This Section..................................................................................................................................................147
Overview...........................................................................................................................................................147
Network Queue Parent Scheduler...............................................................................................................148
Basic Configurations.........................................................................................................................................148
Create a Network Queue QoS Policy..........................................................................................................148
Applying Network Queue Policies ...............................................................................................................151
XMAs and MDAs....................................................................................................................................151
Ethernet Ports ........................................................................................................................................152
SONET/SDH Ports .................................................................................................................................153
Default Network Queue Policy Values .............................................................................................................153
Service Management Tasks .............................................................................................................................158
Deleting QoS Policies..................................................................................................................................159
Remove a Policy from the QoS Configuration.............................................................................................159
Copying and Overwriting QoS Policies .......................................................................................................159
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Quality of Service Guide 5
Editing QoS Policies....................................................................................................................................160
Network Queue QoS Policy Command Reference...........................................................................................161
Command Hierarchies.................................................................................................................................161
Configuration Commands ......................................................................................................................161
Operational Commands .........................................................................................................................162
Show Commands...................................................................................................................................162
Command Descriptions ...............................................................................................................................162
Configuration Commands ......................................................................................................................162
Operational Commands .........................................................................................................................163
Show Commands...................................................................................................................................185
Service Egress and Ingress QoS Policies........................................................................................ 189
In This Section..................................................................................................................................................189
Overview...........................................................................................................................................................190
Basic Configurations.........................................................................................................................................190
Service Egress QoS Policy...............................................................................................................................191
Service Egress QoS Queue ........................................................................................................................192
Percent-Rate Support..................................................................................................................................192
Dynamic MBS for Egress Queue Group Queues........................................................................................193
Queue Length as a Delay Value ............................................................................................................195
Egress SAP Forwarding Class and Forwarding Profile Overrides ..............................................................196
Egress Criteria Classification Directly to Policer .........................................................................................197
Dot1p Egress Remarking ............................................................................................................................199
DEI Egress Remarking...........................................................................................................................200
DSCP/Prec Egress Remarking ...................................................................................................................204
Queue Depth Monitoring .............................................................................................................................205
Service Ingress QoS Policy ..............................................................................................................................207
Service Ingress QoS Queue........................................................................................................................208
Percent-Rate Support..................................................................................................................................209
Service Ingress Forwarding Class (FC) .....................................................................................................210
Service Ingress IP Match Criteria ................................................................................................................211
Service Ingress IPv6 Match Criteria ............................................................................................................212
Service Ingress MAC Match Criteria ...........................................................................................................212
VLAN ID Matching..................................................................................................................................213
Ingress Criteria Classification Directly to Policer .........................................................................................214
Virtual Network Identifier (VNI) Classification..............................................................................................215
FC Mapping Based on EXP Bits .................................................................................................................216
Service Management Tasks .............................................................................................................................217
Applying Service Ingress and Egress Policies ...........................................................................................217
Epipe ......................................................................................................................................................218
IES .........................................................................................................................................................218
VPLS ......................................................................................................................................................219
VPRN .....................................................................................................................................................219
Editing QoS Policies....................................................................................................................................220
Copying and Overwriting QoS Policies .......................................................................................................220
Deleting QoS Policies..................................................................................................................................221
Remove a Policy from the QoS Configuration.............................................................................................221
Service SAP QoS Policy Command Reference ...............................................................................................223
Command Hierarchies.................................................................................................................................223
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6 Quality of Service Guide
Service Ingress QoS Policy Commands ................................................................................................223
Service Egress QoS Policy Commands .................................................................................................227
Operational Commands .........................................................................................................................230
Show Commands...................................................................................................................................231
Command Descriptions ...............................................................................................................................231
Configuration Commands ......................................................................................................................231
Operational Commands .........................................................................................................................232
Show Commands...................................................................................................................................370
Queue Sharing and Redirection........................................................................................................ 389
In This Section..................................................................................................................................................389
Queue Sharing and Redirection .......................................................................................................................389
Supported Platforms....................................................................................................................................390
Queue Group Applications ..........................................................................................................................390
Access SAP Queue Group Applications .....................................................................................................390
Ingress Access Port Queue Group Hardware Queue Allocation.................................................................391
Network Port Queue Groups for IP Interfaces.............................................................................................392
Pseudowire Shaping for Layer 2 and Layer 3 Services ..............................................................................392
QoS on Ingress Bindings.............................................................................................................................393
Queue Group Templates and Port Queue Groups......................................................................................395
Queue Group Templates.............................................................................................................................395
Port Queue Groups .....................................................................................................................................396
Percent-Rate Support ............................................................................................................................396
Forwarding Plane Queue Groups................................................................................................................396
Redirection Models......................................................................................................................................397
Access SAP Forwarding Class Based Redirection .....................................................................................398
Ingress and Egress SAP Forwarding Class Redirection Association Rules ...............................................400
Policy Based Provisioning Model ...........................................................................................................400
SAP-Based Provisioning Model .............................................................................................................402
Access Queue Group Statistics...................................................................................................................404
Port Queue Groups ................................................................................................................................404
Forwarding Plane Queue Groups ..........................................................................................................404
Network IP Interface Forwarding Class-Based Redirection ........................................................................405
Egress Network Forwarding Class Redirection Association Rules .............................................................405
Egress Network IP Interface Statistics ........................................................................................................407
Separate Ingress IPv4 and IPv6 Statistics ..................................................................................................407
Ingress PW Shaping Using Spoke-SDP Forwarding Class-Based Redirection ..........................................407
Feature Configuration ............................................................................................................................408
Provisioning Model.................................................................................................................................409
Ingress Packet Classification .................................................................................................................411
Egress PW Shaping using Spoke-SDP Forwarding Class-Based Redirection ...........................................411
Feature Configuration ............................................................................................................................411
Provisioning Model.................................................................................................................................412
Egress Marking of PW Packet Header...................................................................................................414
Egress Packet Re-Classification Based on IPv4/IPv6 Criteria ...............................................................414
Ingress Per SAP Statistics with Ingress Queue Groups...........................................................................
...415
Ingress and Egress PW Statistics ...............................................................................................................417
Queue Group Behavior on LAG ..................................................................................................................418
Queue Group Queue Instantiation Per Link ................................................................................................418
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Quality of Service Guide 7
Per Link Queue Group Queue Parameters .................................................................................................418
Adding a Queue Group to an Existing LAG.................................................................................................418
Removing a Queue Group from a LAG .......................................................................................................418
Adding a Port to a LAG ...............................................................................................................................419
Basic Configurations.........................................................................................................................................419
Configuring an Ingress Queue Group Template .........................................................................................419
Configuring Egress Queue Group Template ...............................................................................................420
Applying Ingress Queue Group to SAP Ingress Policy ...............................................................................420
Applying Egress Queue Group to SAP Egress Policy.................................................................................421
SAP-based Egress Queue Re-direction .....................................................................................................422
Configuring Queue Group on Ethernet Access Ingress Port.......................................................................423
Configuring Overrides .................................................................................................................................424
Configuring Queue Group on Ethernet Access Egress Port .......................................................................425
Configuring Queue Group for Network Egress Traffic on Port ....................................................................426
Configuring Queue Group for Network Ingress Traffic on Forwarding Plane ..............................................427
Using Queue Groups to Police Ingress/Egress Traffic on Network Interface..............................................428
Configuring Ingress/Egress PW Shaping Using Spoke-SDP Forwarding Class-Based Redirection...........429
Specifying QoS Policies on Service SAPs ..................................................................................................432
QoS Queue Group Template Command Reference ........................................................................................433
Command Hierarchies.................................................................................................................................433
Configuring Egress Queue Group Templates ........................................................................................433
Configuring Ingress Queue Group Templates .......................................................................................434
Show Commands...................................................................................................................................436
Monitor Commands................................................................................................................................436
Command Descriptions ...............................................................................................................................437
Configuration Commands ......................................................................................................................437
Show Commands...................................................................................................................................466
Monitor Commands................................................................................................................................500
QoS Scheduler Policies ..................................................................................................................... 505
In This Section..................................................................................................................................................505
Overview ..........................................................................................................................................................505
Scheduler Policies.......................................................................................................................................505
Egress Port-Based Schedulers ...................................................................................................................506
Service/Subscriber or Multi-service Site Egress Port Bandwidth Allocation ..........................................508
Service or Subscriber or Multi-service site Scheduler Child to Port Scheduler Parent ..........................510
Frame and Packet-Based Bandwidth Allocation ....................................................................................513
Queue Parental Association Scope .......................................................................................................515
Service or Subscriber or Multi-service Site-Level Scheduler Parental Association Scope ....................516
Network Queue Parent Scheduler .........................................................................................................517
Foster Parent Behavior for Orphaned Queues and Schedulers ............................................................517
Congestion Monitoring on Egress Port Scheduler .................................................................................518
Frame-Based Accounting............................................................................................................................524
Operational Modifications.......................................................................................................................524
Existing Egress Port Based Virtual Scheduling......................................................................................525
Queue Behavior Modifications for Frame Based Accounting.................................................................525
Virtual Scheduler Rate and Queue Rate Parameter Interpretation ........................................................525
Virtual Scheduling Unused Bandwidth Distribution .....................................................................................526
Default Unused Bandwidth Distribution..................................................................................................526
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8 Quality of Service Guide
Limit Unused Bandwidth ........................................................................................................................527
Configuring Port Scheduler Policies............................................................................................................529
Port Scheduler Structure........................................................................................................................529
Special Orphan Queue and Scheduler Behavior ...................................................................................529
Packet to Frame Bandwidth Conversion................................................................................................530
Aggregate Rate Limits for Directly Attached Queues.............................................................................531
SAP Egress QoS Policy Queue Parenting.............................................................................................531
Network Queue QoS Policy Queue Parenting .......................................................................................532
Egress Port Scheduler Overrides...........................................................................................................532
Applying a Port Scheduler Policy to a Virtual Port .................................................................................532
Applying Aggregate Rate Limit to a VPORT ..........................................................................................534
Applying a Scheduler Policy to a VPORT ..............................................................................................534
Weighted Scheduler Group in a Port Scheduler Policy..........................................................................536
Basic Configurations ..................................................................................................................................536
Create a QoS Scheduler Policy .............................................................................................................537
Applying Scheduler Policies...................................................................................................................538
Creating a QoS Port Scheduler Policy ...................................................................................................542
Configuring Port Parent Parameters ...........................................................................................................543
Within-CIR Priority Level Parameters ....................................................................................................543
Above-CIR Priority Level Parameters ....................................................................................................544
Configuring Distributed LAG Rate ...............................................................................................................544
Service Management Tasks .............................................................................................................................556
Deleting QoS Policies..................................................................................................................................556
Removing a QoS Policy from a Customer Multi-Service Site.................................................................557
Removing a QoS Policy from SAP(s).....................................................................................................557
Removing a Policy from the QoS Configuration.....................................................................................558
Copying and Overwriting Scheduler Policies ..............................................................................................558
Editing QoS Policies....................................................................................................................................560
QoS Scheduler Policy Command Reference ...................................................................................................561
Command Hierarchies.................................................................................................................................561
Scheduler Policy Configuration Commands...........................................................................................561
Port Scheduler Policy Configuration Commands ...................................................................................561
Operational Commands .........................................................................................................................562
Show Commands..................................................................................................................
.................562
Clear Commands ...................................................................................................................................563
Command Descriptions ...............................................................................................................................564
Configuration Commands ......................................................................................................................564
Operational Commands .........................................................................................................................564
Scheduler Policy Commands .................................................................................................................565
Port Scheduler Policy Commands .........................................................................................................573
Show Commands...................................................................................................................................581
Clear Commands ...................................................................................................................................617
Slope QoS Policies............................................................................................................................. 621
In This Section..................................................................................................................................................621
Overview...........................................................................................................................................................621
Basic Configurations ...................................................................................................................................622
Create a Slope QoS Policy ....................................................................................................................622
Applying Slope Policies..........................................................................................................................623
Table of Contents
Quality of Service Guide 9
Default Slope Policy Values .......................................................................................................................625
Deleting QoS Policies..................................................................................................................................626
Ports.......................................................................................................................................................626
MDA (FP1) .............................................................................................................................................627
FP (FP2 and higher based hardware) ....................................................................................................627
Remove a Policy from the QoS Configuration .......................................................................................628
Copying and Overwriting QoS Policies .......................................................................................................628
Editing QoS Policies....................................................................................................................................629
Slope QoS Policy Command Reference ..........................................................................................................631
Command Hierarchies.................................................................................................................................631
Configuration Commands ......................................................................................................................631
Operational Commands .........................................................................................................................631
Show Commands...................................................................................................................................632
Command Descriptions ...............................................................................................................................632
Configuration Commands ......................................................................................................................632
Operational Commands .........................................................................................................................632
Show Commands...................................................................................................................................638
Shared-Queue QoS Policies .............................................................................................................. 641
In This Section..................................................................................................................................................641
Overview...........................................................................................................................................................641
Multipoint Shared Queuing..........................................................................................................................642
Ingress Queuing Modes of Operation ....................................................................................................642
Ingress Service Queuing........................................................................................................................642
Basic Configurations ...................................................................................................................................647
Modifying the Default Shared-Queue Policy ...............................................................................................648
Applying Shared-Queue Policies ...........................................................................................................648
Default Shared Queue Policy Values .........................................................................................................651
Shared-Queue QoS Policy Command Reference ............................................................................................657
Command Hierarchies.................................................................................................................................657
Configuration Commands ......................................................................................................................657
Show Commands...................................................................................................................................657
Command Descriptions ...............................................................................................................................658
Configuration Commands ......................................................................................................................658
Show Commands...................................................................................................................................667
Advanced QoS Policies ..................................................................................................................... 669
In This Section..................................................................................................................................................669
Overview...........................................................................................................................................................669
Basic Configurations ...................................................................................................................................670
Create an Advanced QoS Policy............................................................................................................670
Applying Advanced Policies ...................................................................................................................671
Default Advanced Policy Values ................................................................................................................672
Deleting QoS Policies..................................................................................................................................672
Queue Group .........................................................................................................................................672
SAP Ingress ...........................................................................................................................................673
SAP Egress............................................................................................................................................673
Copying and Overwriting Advanced Policies...............................................................................................673
Editing Advanced Policies ...........................................................................................................................673
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10 Quality of Service Guide
Advanced QoS Policy Command Reference....................................................................................................675
Command Hierarchies.................................................................................................................................675
Configuration Commands ......................................................................................................................675
Operational Commands .........................................................................................................................675
Show Commands...................................................................................................................................676
Command Descriptions ...............................................................................................................................676
Configuration Commands ......................................................................................................................676
Operational Commands .........................................................................................................................677
Show Commands...................................................................................................................................690
QoS ATM Traffic Descriptor Profiles ............................................................................................... 691
In This Section..................................................................................................................................................691
Overview...........................................................................................................................................................691
ATM Traffic Descriptor Profiles ...................................................................................................................691
ATM Traffic Management.......................................................................................................................691
QoS Model for ATM-Based Services .....................................................................................................692
ATM Service Categories ........................................................................................................................693
ATM Traffic Descriptors and QoS Parameters.......................................................................................693
Policing...................................................................................................................................................694
Shaping ..................................................................................................................................................694
ATM Queuing and Scheduling ...............................................................................................................694
Congestion Avoidance ...........................................................................................................................695
Basic Configurations ...................................................................................................................................695
Create an ATM-TD-Profile QoS Policy...................................................................................................695
Applying ATM-TD-Profile Policies ..........................................................................................................696
Default ATM-TD-Profile Policy Values .......................................................................................................698
Service Management Tasks .............................................................................................................................699
Removing a Profile from the QoS Configuration .........................................................................................699
Copying and Overwriting Profile ..................................................................................................................699
Editing QoS Policies....................................................................................................................................700
ATM QoS Policy Command Reference ............................................................................................................701
Command Hierarchies.................................................................................................................................701
Configuration Commands ......................................................................................................................701
Operational Commands .........................................................................................................................701
Show Commands ..................................................................................................................................701
Command Descriptions ...............................................................................................................................702
Configuration Commands ......................................................................................................................702
Named Pools....................................................................................................................................... 719
In This Section..................................................................................................................................................719
Overview...........................................................................................................................................................719
Named Pool Mode for IOM3-XP Card.........................................................................................................722
Basic Configuration .....................................................................................................................................723
Create a Named Pool QoS Policy..........................................................................................................723
Named pool Configuration Procedure ....................................................................................................723
Allocation Steps .....................................................................................................................................725
Named Pools QoS Policy Command Reference ..............................................................................................727
Command Hierarchies.................................................................................................................................727
Configuration Commands ......................................................................................................................727
Table of Contents
Quality of Service Guide 11
Show Commands...................................................................................................................................728
Command Descriptions ...............................................................................................................................728
Configuration Commands ......................................................................................................................728
Named Pool Policy Creation ..................................................................................................................729
Shared Queue QoS Commands ............................................................................................................743
Network Queue QoS Policy Commands ................................................................................................746
Show Commands...................................................................................................................................750
High Scale Ethernet MDA Capabilities ............................................................................................. 757
In This Section..................................................................................................................................................757
HSMDA QoS Model..........................................................................................................................................757
Queue Scaling.............................................................................................................................................758
Port-Based Scheduling................................................................................................................................758
Dual Pass Queuing .....................................................................................................................................762
Egress Intermediate Destination Secondary Shapers.................................................................................762
Packet and Octet Counting .........................................................................................................................764
Above CIR Discard with PIR Bypass...........................................................................................................766
HSMDA Ingress Queue Policing Mode ..................................................................................................766
HSMDA Buffer Utilization Controls..............................................................................................................768
HSMDA Buffer Pools..............................................................................................................................768
Identifying Queue Groups as Provisioned or System ............................................................................768
Provisioned and System Port Class Pools.............................................................................................769
Aggregate Pools for Type and Class Separation ...................................................................................770
Use of Aggregate Control Buffer Pools ..................................................................................................771
HSMDA Buffer Pool Policy .....................................................................................................................773
Port Class Pool Sizing............................................................................................................................775
HSMDA Available Buffer Register Operation.........................................................................................775
HSMDA Queue Congestion and Buffer Utilization Controls ........................................................................776
Maximum HSMDA Queue Depth ...........................................................................................................777
Control Plane HSMDA RED Slope Policy Management ........................................................................777
HSMDA Slope Policy MBS Parameter ...................................................................................................778
HSMDA Slope Policy Slope Parameters................................................................................................778
HSMDA Slope Shutdown Behavior........................................................................................................782
Ingress Packet Mapping to HSMDA RED Slope ....................................................................................782
Egress Packet Mapping to HSMDA RED Slope ....................................................................................782
HSMDA Queue Congestion or Pool Congestion Discard Stats .............................................................783
Egress Queue CIR Based Dot1P Remarking..............................................................................................784
SAP Ingress and SAP Egress QoS Policies.....................................................................................................784
SAP Ingress QoS Policy..............................................................................................................................784
SAP Egress QoS Policy ..............................................................................................................................785
Subscriber Queuing Differences.......................................................................................................................786
HSMDA Features .............................................................................................................................................786
HSMDA LAG ...............................................................................................................................................786
Billing...........................................................................................................................................................787
Resource Management ...............................................................................................................................787
HSMDA Queue Groups...............................................................................................................................788
Scheduling Classes.............................................................................................................
...................788
Scheduling Class Weighted Groups ......................................................................................................789
Scheduler Strict Priority Levels ..............................................................................................................789
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12 Quality of Service Guide
Strict Priority Level PIR ..........................................................................................................................789
Scheduler Maximum Rate ......................................................................................................................790
HSMDA Scheduler Policy Overrides ......................................................................................................790
Orphan Queues......................................................................................................................................790
Default HSMDA Scheduling Policy ........................................................................................................790
Basic HSMDA Configurations .....................................................................................................................791
HSMDA Pool Policies.............................................................................................................................791
HSMDA Scheduler Policies....................................................................................................................792
HSMDA Slope Policies...........................................................................................................................793
Egress Queue Group .............................................................................................................................793
Configuring HSMDA Queue Group Overrides .......................................................................................794
Applying HSMDA Policies ...........................................................................................................................794
HSMDA Command Reference .........................................................................................................................797
Command Hierarchies.................................................................................................................................797
Show Commands...................................................................................................................................798
Command Descriptions ...............................................................................................................................798
Configuration Commands ......................................................................................................................798
QoS in MC-MLPPP ............................................................................................................................. 829
In This Section..................................................................................................................................................829
Overview...........................................................................................................................................................829
Ingress MLPPP Class Reassembly.............................................................................................................833
Configuring MC-MLPPP QoS Parameters ..................................................................................................833
Basic Configurations.........................................................................................................................................834
Configuring MC-MLPPP ..............................................................................................................................836
QoS in MLFR and FRF.12 Fragmentation........................................................................................................836
QoS in MLFR...............................................................................................................................................836
QoS in FRF.12 End-to-End Fragmentation .................................................................................................839
MLPPP Command Reference ..........................................................................................................................841
Command Hierarchies.................................................................................................................................841
Configuration Commands ......................................................................................................................841
Command Descriptions ...............................................................................................................................842
Configuration Commands ......................................................................................................................842
Class Fair Hierarchical Policing (CFHP)........................................................................................... 847
In This Section..................................................................................................................................................847
Introduction.......................................................................................................................................................847
Parent Policer Priority and Unfair Sensitive Discard Thresholds......................................................................849
CFHP Ingress and Egress Use Cases .............................................................................................................851
Post-CFHP Queuing and Scheduling ...............................................................................................................851
Ingress CFHP Queuing ...............................................................................................................................851
Egress CFHP Queuing................................................................................................................................852
Policer to Local Queue Mapping ............................................................................................................852
Egress Subscriber CFHP Queuing..............................................................................................................853
Subscriber Destination String Queue Group Identification.....................................................................854
SAP Default Destination String ...................................................................................................................854
CFHP Policer Control Policy.............................................................................................................................855
Policer Control Policy Root Arbiter ..............................................................................................................855
Tier 1 and Tier 2 Explicit Arbiters ................................................................................................................856
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Quality of Service Guide 13
Explicit Arbiter Rate Limits ..........................................................................................................................856
CFHP with Child Policer Exceed PIR Enabled ...........................................................................................856
CFHP Child Policer Definition and Creation .....................................................................................................857
Policer Enabled SAP QoS Policy Applicability .................................................................................................858
Child Policer Parent Association ......................................................................................................................858
Profile Capped Policers ....................................................................................................................................859
Policer Interaction with Initial Profile, Discard Eligibility, and Ingress Priority...................................................861
Ingress ‘Undefined’ Initial Profile .................................................................................................................863
Ingress Explicitly ‘In-Profile’ State Packet Handling without Profile-Capped Mode.....................................863
Ingress Explicitly ‘In-Profile’ State Packet Handling with Profile-Capped Mode..........................................864
Ingress Explicit ‘Out-of-Profile’ State Packet Handling................................................................................864
Egress Explicit Profile Reclassification........................................................................................................864
Preserving Out of Profile State at Egress Policer........................................................................................865
Egress Policer CIR Packet Handling without Profile Capped Mode............................................................865
Egress Policer CIR Packet Handling with Profile Capped Mode.................................................................865
Forwarding Traffic Exceeding PIR in Egress Policers .................................................................................866
Ingress Child Policer Stat-Mode ..................................................................................................................866
Egress Child Policer Stat-Mode ..................................................................................................................869
Profile Preferred Mode Root Policers ...............................................................................................................870
Class Fair Hierarchical Policing (CFHP) Policy Command Reference .............................................................873
Command Hierarchies.................................................................................................................................873
Class Fair Hierarchical Policing Commands ..........................................................................................873
Command Descriptions ...............................................................................................................................874
Configuration Commands ......................................................................................................................874
Frequently Used QoS Terms ............................................................................................................ 887
In This Chapter .................................................................................................................................................887
Above CIR Distribution .....................................................................................................................................888
Available Bandwidth .........................................................................................................................................888
CBS ..................................................................................................................................................................888
CIR ...................................................................................................................................................................888
CIR Level..........................................................................................................................................................889
CIR Weight .......................................................................................................................................................889
Child .................................................................................................................................................................890
Level .................................................................................................................................................................890
MBS..................................................................................................................................................................890
MCR .................................................................................................................................................................890
Offered Load.....................................................................................................................................................891
Orphan..............................................................................................................................................................891
Parent ...............................................................................................................................................................891
Queue...............................................................................................................................................................892
Rate ..................................................................................................................................................................892
Root (Scheduler) ..............................................................................................................................................892
Scheduler Policy...............................................................................................................................................893
Tier ...................................................................................................................................................................893
Virtual Scheduler ..............................................................................................................................................893
Weight ..............................................................................................................................................................893
Within CIR Distribution .....................................................................................................................................894
Quality of Service Guide 15
Getting Started
About This Guide
This guide describes the Quality of Service (QoS) provided by the routers and presents
examples to configure and implement various protocols and services.
This document is organized into functional chapters and provides concepts and descriptions
of the implementation flow, as well as Command Line Interface (CLI) syntax and command
usage.
Unless otherwise specified, the topics and commands described in this document apply to the:
• 7450 ESS
• 7750 SR
• 7950 XRS
7450 ESS applicability statements refer to the 7450 ESS when it is not running in mixed
mode. 7750 SR applicability statements refer to the 7750 SR-7/12, 7750 SR-12e, 7750 SR-
a4/a8 and 7750 SR-e1/e2/e3 platforms unless otherwise specified.
Command outputs shown in this guide are examples only; actual displays may differ
depending on supported functionality and user configuration.
Alcatel-Lucent SR-Series Router Services
Configuration Process
Table 1 lists the tasks necessary to configure and apply QoS policies. This guide is presented
in an overall logical configuration flow. Each section describes a software area and provides
CLI syntax and command usage to configure parameters for a functional area.
Alcatel-Lucent SR-Series Router Services Configuration Process
16 Quality of Service Guide
Table 1: Configuration Process
Area Task Chapter Supported
Platform
Policy configuration Configuring QoS Policies
Network Network QoS Policies All
Network queue Network Queue QoS Policies All
SAP ingress/SAP egress Service Egress and Ingress QoS
Policies
All
Scheduler QoS Scheduler Policies All
Slope Slope QoS Policies All
Shared queue Shared-Queue QoS Policies 7450 ESS,
7750 SR
ATM traffic descriptor QoS ATM Traffic Descriptor Profiles 7750 SR
Named pools Named Pools 7450 ESS,
7750 SR
HSMDA High Scale Ethernet MDA
Capabilities
7750 SR
CFHP Class Fair Hierarchical Policing
(CFHP)
7750 SR,
7950 XRS
Reference List of IEEE, IETF, and
other proprietary entities
Standards and Protocol Support All
Quality of Service Guide 17
QoS Policies
In This Chapter
This chapter provides information about Quality of Service (QoS) policy management.
Topics in this chapter include:
• QoS Overview
→ Forwarding Classes
→ Queue Parameters
• QoS Policies
→ Service versus Network QoS
→ QoS Policy Entities
→ Network QoS Policies
→ Network Queue QoS Policies
→ Service Ingress QoS Policies
→ Service Egress QoS Policies
→ Named Pool Policies
→ Slope Policies
→ Scheduler Policies
→ Shared Queues
→ ATM Traffic Descriptor Profiles
→ Configuration Notes
QoS Overview
Routers are designed with Quality of Service (QoS) mechanisms on both ingress and egress
to support multiple customers and multiple services per physical interface. The router has an
extensive and flexible capabilities to classify, police, shape and mark traffic.
QoS Overview
18 Quality of Service Guide
In the Alcatel-Lucent service router’s service model, a service is provisioned on the provider-
edge (PE) equipment. Service data is encapsulated and then sent in a service tunnel to the far-
end Alcatel-Lucent service router where the service data is delivered.
The operational theory of a service tunnel is that the encapsulation of the data between the
two Alcatel Lucent service routers (such as the 7950 XRS, 7750 SR, 7750 SR MG and
7450 ESS) appear like a Layer 2 path to the service data although it is really traversing an IP
or IP/MPLS core. The tunnel from one edge device to the other edge device is provisioned
with an encapsulation and the services are mapped to the tunnel that most appropriately
supports the service needs.
The router supports eight forwarding classes internally named: Network-Control, High-1,
Expedited, High-2, Low-1, Assured, Low-2 and Best-Effort. The forwarding classes are
discussed in more detail in Forwarding Classes.
Router QoS policies control how QoS is handled at distinct points in the service delivery
model within the device. There are different types of QoS policies that cater to the different
QoS needs at each point in the service delivery model. QoS policies are defined in a global
context in the router and only take effect when the policy is applied to a relevant entity.
QoS policies are uniquely identified with a policy ID number or name. Policy ID 1 or Policy
ID “default” is reserved for the default policy which is used if no policy is explicitly applied.
The QoS policies within the router can be divided into three main types:
• QoS policies are used for classification, defining and queuing attributes and marking.
• Slope policies define default buffer allocations and WRED slope definitions.
• Scheduler policies determine how queues are scheduled.
Forwarding Classes
Routers support multiple forwarding classes and class-based queuing, so the concept of
forwarding classes is common to all of the QoS policies.
Each forwarding class (also called Class of Service (CoS)) is important only in relation to the
other forwarding classes. A forwarding class provides network elements a method to weigh
the relative importance of one packet over another in a different forwarding class.
Queues are created for a specific forwarding class to determine the manner in which the queue
output is scheduled into the switch fabric. The forwarding class of the packet, along with the
profile state, determines how the packet is queued and handled (the per hop behavior (PHB))
at each hop along its path to a destination egress point. Routers support eight (8) forwarding
classes (Table 2).
QoS Policies
Quality of Service Guide 19
Table 2 presents the default definitions for the forwarding classes. The forwarding class
behavior, in terms of ingress marking interpretation and egress marking, can be changed by
a Network QoS Policies. All forwarding class queues support the concept of in-profile and
out-of-profile, and exceed-profile at egress.
The forwarding classes can be classified into three class types:
• High priority/Premium
• Assured
•Best effort
High Priority Classes
The high priority forwarding classes are Network Control (nc), Expedited (ef), High 1 (h1),
and High 2 (h2). High priority forwarding classes are always serviced at congestion points
over other forwarding classes; this behavior is determined by the router queue scheduling
algorithm (Virtual Hierarchical Scheduling).
Table 2: Forwarding Classes
FC-ID FC Name FC
Designatio
n
DiffServ
Name
Class Type Notes
7Network
Control
NC NC2 High-Priority Intended for network control traffic
6 High-1 H1 NC1 Intended for a second network control
class or delay/jitter sensitive traffic
5 Expedited EF EF Intended for delay/jitter sensitive traffic
4 High-2 H2 AF4 Intended for delay/jitter sensitive traffic
3 Low-1 L1 AF2 Assured Intended for assured traffic. Also is the
default priority for network management
traffic
2 Assured AF AF1 Intended for assured traffic
1 Low-2 L2 CS1 Best Effort Intended for BE traffic
0 Best Effort BE BE
QoS Overview
20 Quality of Service Guide
With a strict PHB at each network hop, service latency is mainly affected by the amount of
high-priority traffic at each hop. These classes are intended to be used for network control
traffic or for delay or jitter-sensitive services.
If the service core network is over-subscribed, a mechanism to traffic engineer a path through
the core network and reserve bandwidth must be used to apply strict control over the delay
and bandwidth requirements of high-priority traffic. In the router, RSVP-TE can be used to
create a path defined by an MPLS LSP through the core. Premium services are then mapped
to the LSP with care exercised to not oversubscribe the reserved bandwidth.
If the core network has sufficient bandwidth, it is possible to effectively support the delay and
jitter characteristics of high-priority traffic without utilizing traffic engineered paths, as long
as the core treats high-priority traffic with the proper PHB.
Assured Classes
The assured forwarding classes are Assured (af) and Low 1 (l1). Assured forwarding classes
provide services with a committed rate and a peak rate much like Frame Relay. Packets
transmitted through the queue at or below the committed transmission rate are marked in-
profile. If the core service network has sufficient bandwidth along the path for the assured
traffic, all aggregate in-profile service packets will reach the service destination. Packets
transmitted out the service queue that are above the committed rate will be marked out-of-
profile or exceed-profile (if exceeding the PIR is enabled). When an assured out-of-profile or
exceed-profile service packet is received at a congestion point in the network, it will be
discarded before in-profile assured service packets.
Multiple assured classes are supported with relative weighting between them. In DiffServ, the
code points for the various Assured classes are AF4, AF3, AF2 and AF1. Typically, AF4 has
the highest weight of the four and AF1 the lowest. The Assured and Low 1 classes are
differentiated based on the default DSCP mappings. All DSCP and EXP mappings can be
modified by the user.
Best-Effort Classes
The best-effort classes are Low 2 (l2) and Best-Effort (be). The best-effort forwarding classes
have no delivery guarantees. All packets within this class are treated by default as out-of-
profile assured service packets.
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Alcatel-Lucent 7750 Quality Of Service Manual
- Category
- Software
- Type
- Quality Of Service Manual
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